Date: Mon, 18 Nov 2002 11:30:01 -0800 (PST) From: "Ulrich 'Q' Spoerlein" <q@uni.de> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/41747: quake won't play sound with newpcm driver Message-ID: <200211181930.gAIJU1BS093143@freefall.freebsd.org>
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The following reply was made to PR kern/41747; it has been noted by GNATS.
From: "Ulrich 'Q' Spoerlein" <q@uni.de>
To: freebsd-gnats-submit@FreeBSD.org, q@uni.de,
Orion Hodson <orion@FreeBSD.org>
Cc:
Subject: Re: kern/41747: quake won't play sound with newpcm driver
Date: Mon, 18 Nov 2002 20:21:26 +0100
So,
after several MFCs of the -current pcm-driver, this problem still exists,
and is not limited to Quake.
Maxim Sobolev posted a thread on -multimedia with a small test program
triggering the issue on -STABLE (but not on -CURRENT). It looks like the
pcm driver or the mmap() call need/want read-write access to the device
(though write-only access should be fine)
this code breaks on -STABLE:
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/soundcard.h>
#include <err.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
int bytesok = 0;
void
catch(int signum)
{
printf("Signal %d catched, only %d bytes cleared\n", signum,
bytesok);
exit (1);
}
int main()
{
int fd;
audio_buf_info info;
int frags;
void *p;
fd = open("/dev/dsp", O_WRONLY | O_DIRECT);
/* Changing this to read/write access....
fd = open("/dev/dsp", O_RDWR);
*/
if (fd == -1)
err(1, "can't open audio device");
frags = 0x0020000B; /* 64K buffer (32 * 2^11) */
if (ioctl(fd, SNDCTL_DSP_SETFRAGMENT, &frags) == -1)
err(1, "can't set fragments");
if (ioctl(fd, SNDCTL_DSP_GETOSPACE, &info) == -1)
err(1, "can't get info about i/o space");
p = mmap(NULL, info.fragstotal * info.fragsize, PROT_WRITE,
MAP_SHARED,
fd, 0);
/* ...and this to read/write works
p = mmap(NULL, info.fragstotal * info.fragsize, PROT_READ|PROT_WRITE,
MAP_SHARED,
fd, 0);
*/
if (p == MAP_FAILED)
err(1, "can't mmap() output buffer");
signal(SIGBUS, catch);
for (bytesok = 0; bytesok < info.fragstotal * info.fragsize;
bytesok++)
*((char *)p + bytesok) = 0;
exit (0);
}
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